Dear eCognition boffins

I really like the create subset algorithm as it allows for automation and parallelization over very large regions when using eCognition engine. I do not like using tiles as there are often edge effects (especially when working with DEMs). Subsets allow for creating an overlap among subsets and the resulting images (DEMs) can be mosaiced to produce a seamless product. However, I am currently doing the mosaicing outside of eCognition (output DEMs for individual subsets and then mosaic with blending). This is a bit of a schlep and I notice that when running the subsets on the engine the stitching option is available to stitch the subsets? Does it stitch the outputs (images)? If so, how does it handle overlapping areas?

I guess I can just experiment and try to figure it out, but I thought I would rather save time and ask! :-)

Thanks,

Adriaan.

 

3 comments

  • Christian Weise

    Hello Adriaan,

    Your workflow is interesting. Of course (ツ).

    The 'submit scenes for analysis' algorithm offers overlap handling during stitching of subsets. You have to define here if you want to create Intersection objects or if overlapping objects have to be merged. Furthermore if the objects may have different classifications, you can define a class to be assigned to the image objects resulting from overlap handling.

    Hope that helps,
    Cheers,
    Christian

  • Adriaan van Niekerk

    Hi Christain

    This is great news. What happens to the temporary image layers during merging?

    Regards,
    Adriaan.

  • Christian Weise

    Hi Adriaan,

    Temporary image layers will be stitched as well (as long as you have to changed the 'save temporary layers' option with 'set rule set options' algorithm or under Tools>Options...). Please note, the subset (or tile order) defines which pixel value will be used in the stitched projects (subset/tile with highest order).

    Regards,
    Christian

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